Ugh. One month later…   If you still have the problem publish your KSP.log and I will see what's missing. You, perhaps, had installed Firespitter Core only? In a way or another: ANNOUNCE Release 26.6.2.1 is available for downloading, with the following changes: Pulling a fast one: fixing the cause of the infamous TweakScale's warning NULL ConfigNode for <part-path> (unholy characters on the name?). Trying partConfig instead! at the same trying to salvage any current